| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * scsi_scan.c |
| * |
| * Copyright (C) 2000 Eric Youngdale, |
| * Copyright (C) 2002 Patrick Mansfield |
| * |
| * The general scanning/probing algorithm is as follows, exceptions are |
| * made to it depending on device specific flags, compilation options, and |
| * global variable (boot or module load time) settings. |
| * |
| * A specific LUN is scanned via an INQUIRY command; if the LUN has a |
| * device attached, a scsi_device is allocated and setup for it. |
| * |
| * For every id of every channel on the given host: |
| * |
| * Scan LUN 0; if the target responds to LUN 0 (even if there is no |
| * device or storage attached to LUN 0): |
| * |
| * If LUN 0 has a device attached, allocate and setup a |
| * scsi_device for it. |
| * |
| * If target is SCSI-3 or up, issue a REPORT LUN, and scan |
| * all of the LUNs returned by the REPORT LUN; else, |
| * sequentially scan LUNs up until some maximum is reached, |
| * or a LUN is seen that cannot have a device attached to it. |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/moduleparam.h> |
| #include <linux/init.h> |
| #include <linux/blkdev.h> |
| #include <linux/delay.h> |
| #include <linux/kthread.h> |
| #include <linux/spinlock.h> |
| #include <linux/async.h> |
| #include <linux/slab.h> |
| #include <asm/unaligned.h> |
| |
| #include <scsi/scsi.h> |
| #include <scsi/scsi_cmnd.h> |
| #include <scsi/scsi_device.h> |
| #include <scsi/scsi_driver.h> |
| #include <scsi/scsi_devinfo.h> |
| #include <scsi/scsi_host.h> |
| #include <scsi/scsi_transport.h> |
| #include <scsi/scsi_dh.h> |
| #include <scsi/scsi_eh.h> |
| |
| #include "scsi_priv.h" |
| #include "scsi_logging.h" |
| |
| #define ALLOC_FAILURE_MSG KERN_ERR "%s: Allocation failure during" \ |
| " SCSI scanning, some SCSI devices might not be configured\n" |
| |
| /* |
| * Default timeout |
| */ |
| #define SCSI_TIMEOUT (2*HZ) |
| #define SCSI_REPORT_LUNS_TIMEOUT (30*HZ) |
| |
| /* |
| * Prefix values for the SCSI id's (stored in sysfs name field) |
| */ |
| #define SCSI_UID_SER_NUM 'S' |
| #define SCSI_UID_UNKNOWN 'Z' |
| |
| /* |
| * Return values of some of the scanning functions. |
| * |
| * SCSI_SCAN_NO_RESPONSE: no valid response received from the target, this |
| * includes allocation or general failures preventing IO from being sent. |
| * |
| * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is available |
| * on the given LUN. |
| * |
| * SCSI_SCAN_LUN_PRESENT: target responded, and a device is available on a |
| * given LUN. |
| */ |
| #define SCSI_SCAN_NO_RESPONSE 0 |
| #define SCSI_SCAN_TARGET_PRESENT 1 |
| #define SCSI_SCAN_LUN_PRESENT 2 |
| |
| static const char *scsi_null_device_strs = "nullnullnullnull"; |
| |
| #define MAX_SCSI_LUNS 512 |
| |
| static u64 max_scsi_luns = MAX_SCSI_LUNS; |
| |
| module_param_named(max_luns, max_scsi_luns, ullong, S_IRUGO|S_IWUSR); |
| MODULE_PARM_DESC(max_luns, |
| "last scsi LUN (should be between 1 and 2^64-1)"); |
| |
| #ifdef CONFIG_SCSI_SCAN_ASYNC |
| #define SCSI_SCAN_TYPE_DEFAULT "async" |
| #else |
| #define SCSI_SCAN_TYPE_DEFAULT "sync" |
| #endif |
| |
| char scsi_scan_type[7] = SCSI_SCAN_TYPE_DEFAULT; |
| |
| module_param_string(scan, scsi_scan_type, sizeof(scsi_scan_type), |
| S_IRUGO|S_IWUSR); |
| MODULE_PARM_DESC(scan, "sync, async, manual, or none. " |
| "Setting to 'manual' disables automatic scanning, but allows " |
| "for manual device scan via the 'scan' sysfs attribute."); |
| |
| static unsigned int scsi_inq_timeout = SCSI_TIMEOUT/HZ + 18; |
| |
| module_param_named(inq_timeout, scsi_inq_timeout, uint, S_IRUGO|S_IWUSR); |
| MODULE_PARM_DESC(inq_timeout, |
| "Timeout (in seconds) waiting for devices to answer INQUIRY." |
| " Default is 20. Some devices may need more; most need less."); |
| |
| /* This lock protects only this list */ |
| static DEFINE_SPINLOCK(async_scan_lock); |
| static LIST_HEAD(scanning_hosts); |
| |
| struct async_scan_data { |
| struct list_head list; |
| struct Scsi_Host *shost; |
| struct completion prev_finished; |
| }; |
| |
| /** |
| * scsi_complete_async_scans - Wait for asynchronous scans to complete |
| * |
| * When this function returns, any host which started scanning before |
| * this function was called will have finished its scan. Hosts which |
| * started scanning after this function was called may or may not have |
| * finished. |
| */ |
| int scsi_complete_async_scans(void) |
| { |
| struct async_scan_data *data; |
| |
| do { |
| if (list_empty(&scanning_hosts)) |
| return 0; |
| /* If we can't get memory immediately, that's OK. Just |
| * sleep a little. Even if we never get memory, the async |
| * scans will finish eventually. |
| */ |
| data = kmalloc(sizeof(*data), GFP_KERNEL); |
| if (!data) |
| msleep(1); |
| } while (!data); |
| |
| data->shost = NULL; |
| init_completion(&data->prev_finished); |
| |
| spin_lock(&async_scan_lock); |
| /* Check that there's still somebody else on the list */ |
| if (list_empty(&scanning_hosts)) |
| goto done; |
| list_add_tail(&data->list, &scanning_hosts); |
| spin_unlock(&async_scan_lock); |
| |
| printk(KERN_INFO "scsi: waiting for bus probes to complete ...\n"); |
| wait_for_completion(&data->prev_finished); |
| |
| spin_lock(&async_scan_lock); |
| list_del(&data->list); |
| if (!list_empty(&scanning_hosts)) { |
| struct async_scan_data *next = list_entry(scanning_hosts.next, |
| struct async_scan_data, list); |
| complete(&next->prev_finished); |
| } |
| done: |
| spin_unlock(&async_scan_lock); |
| |
| kfree(data); |
| return 0; |
| } |
| |
| /** |
| * scsi_unlock_floptical - unlock device via a special MODE SENSE command |
| * @sdev: scsi device to send command to |
| * @result: area to store the result of the MODE SENSE |
| * |
| * Description: |
| * Send a vendor specific MODE SENSE (not a MODE SELECT) command. |
| * Called for BLIST_KEY devices. |
| **/ |
| static void scsi_unlock_floptical(struct scsi_device *sdev, |
| unsigned char *result) |
| { |
| unsigned char scsi_cmd[MAX_COMMAND_SIZE]; |
| |
| sdev_printk(KERN_NOTICE, sdev, "unlocking floptical drive\n"); |
| scsi_cmd[0] = MODE_SENSE; |
| scsi_cmd[1] = 0; |
| scsi_cmd[2] = 0x2e; |
| scsi_cmd[3] = 0; |
| scsi_cmd[4] = 0x2a; /* size */ |
| scsi_cmd[5] = 0; |
| scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, result, 0x2a, NULL, |
| SCSI_TIMEOUT, 3, NULL); |
| } |
| |
| /** |
| * scsi_alloc_sdev - allocate and setup a scsi_Device |
| * @starget: which target to allocate a &scsi_device for |
| * @lun: which lun |
| * @hostdata: usually NULL and set by ->slave_alloc instead |
| * |
| * Description: |
| * Allocate, initialize for io, and return a pointer to a scsi_Device. |
| * Stores the @shost, @channel, @id, and @lun in the scsi_Device, and |
| * adds scsi_Device to the appropriate list. |
| * |
| * Return value: |
| * scsi_Device pointer, or NULL on failure. |
| **/ |
| static struct scsi_device *scsi_alloc_sdev(struct scsi_target *starget, |
| u64 lun, void *hostdata) |
| { |
| struct scsi_device *sdev; |
| int display_failure_msg = 1, ret; |
| struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); |
| |
| sdev = kzalloc(sizeof(*sdev) + shost->transportt->device_size, |
| GFP_ATOMIC); |
| if (!sdev) |
| goto out; |
| |
| sdev->vendor = scsi_null_device_strs; |
| sdev->model = scsi_null_device_strs; |
| sdev->rev = scsi_null_device_strs; |
| sdev->host = shost; |
| sdev->queue_ramp_up_period = SCSI_DEFAULT_RAMP_UP_PERIOD; |
| sdev->id = starget->id; |
| sdev->lun = lun; |
| sdev->channel = starget->channel; |
| mutex_init(&sdev->state_mutex); |
| sdev->sdev_state = SDEV_CREATED; |
| INIT_LIST_HEAD(&sdev->siblings); |
| INIT_LIST_HEAD(&sdev->same_target_siblings); |
| INIT_LIST_HEAD(&sdev->cmd_list); |
| INIT_LIST_HEAD(&sdev->starved_entry); |
| INIT_LIST_HEAD(&sdev->event_list); |
| spin_lock_init(&sdev->list_lock); |
| mutex_init(&sdev->inquiry_mutex); |
| INIT_WORK(&sdev->event_work, scsi_evt_thread); |
| INIT_WORK(&sdev->requeue_work, scsi_requeue_run_queue); |
| |
| sdev->sdev_gendev.parent = get_device(&starget->dev); |
| sdev->sdev_target = starget; |
| |
| /* usually NULL and set by ->slave_alloc instead */ |
| sdev->hostdata = hostdata; |
| |
| /* if the device needs this changing, it may do so in the |
| * slave_configure function */ |
| sdev->max_device_blocked = SCSI_DEFAULT_DEVICE_BLOCKED; |
| |
| /* |
| * Some low level driver could use device->type |
| */ |
| sdev->type = -1; |
| |
| /* |
| * Assume that the device will have handshaking problems, |
| * and then fix this field later if it turns out it |
| * doesn't |
| */ |
| sdev->borken = 1; |
| |
| if (shost_use_blk_mq(shost)) |
| sdev->request_queue = scsi_mq_alloc_queue(sdev); |
| else |
| sdev->request_queue = scsi_old_alloc_queue(sdev); |
| if (!sdev->request_queue) { |
| /* release fn is set up in scsi_sysfs_device_initialise, so |
| * have to free and put manually here */ |
| put_device(&starget->dev); |
| kfree(sdev); |
| goto out; |
| } |
| WARN_ON_ONCE(!blk_get_queue(sdev->request_queue)); |
| sdev->request_queue->queuedata = sdev; |
| |
| if (!shost_use_blk_mq(sdev->host)) { |
| blk_queue_init_tags(sdev->request_queue, |
| sdev->host->cmd_per_lun, shost->bqt, |
| shost->hostt->tag_alloc_policy); |
| } |
| scsi_change_queue_depth(sdev, sdev->host->cmd_per_lun ? |
| sdev->host->cmd_per_lun : 1); |
| |
| scsi_sysfs_device_initialize(sdev); |
| |
| if (shost->hostt->slave_alloc) { |
| ret = shost->hostt->slave_alloc(sdev); |
| if (ret) { |
| /* |
| * if LLDD reports slave not present, don't clutter |
| * console with alloc failure messages |
| */ |
| if (ret == -ENXIO) |
| display_failure_msg = 0; |
| goto out_device_destroy; |
| } |
| } |
| |
| return sdev; |
| |
| out_device_destroy: |
| __scsi_remove_device(sdev); |
| out: |
| if (display_failure_msg) |
| printk(ALLOC_FAILURE_MSG, __func__); |
| return NULL; |
| } |
| |
| static void scsi_target_destroy(struct scsi_target *starget) |
| { |
| struct device *dev = &starget->dev; |
| struct Scsi_Host *shost = dev_to_shost(dev->parent); |
| unsigned long flags; |
| |
| BUG_ON(starget->state == STARGET_DEL); |
| starget->state = STARGET_DEL; |
| transport_destroy_device(dev); |
| spin_lock_irqsave(shost->host_lock, flags); |
| if (shost->hostt->target_destroy) |
| shost->hostt->target_destroy(starget); |
| list_del_init(&starget->siblings); |
| spin_unlock_irqrestore(shost->host_lock, flags); |
| put_device(dev); |
| } |
| |
| static void scsi_target_dev_release(struct device *dev) |
| { |
| struct device *parent = dev->parent; |
| struct scsi_target *starget = to_scsi_target(dev); |
| |
| kfree(starget); |
| put_device(parent); |
| } |
| |
| static struct device_type scsi_target_type = { |
| .name = "scsi_target", |
| .release = scsi_target_dev_release, |
| }; |
| |
| int scsi_is_target_device(const struct device *dev) |
| { |
| return dev->type == &scsi_target_type; |
| } |
| EXPORT_SYMBOL(scsi_is_target_device); |
| |
| static struct scsi_target *__scsi_find_target(struct device *parent, |
| int channel, uint id) |
| { |
| struct scsi_target *starget, *found_starget = NULL; |
| struct Scsi_Host *shost = dev_to_shost(parent); |
| /* |
| * Search for an existing target for this sdev. |
| */ |
| list_for_each_entry(starget, &shost->__targets, siblings) { |
| if (starget->id == id && |
| starget->channel == channel) { |
| found_starget = starget; |
| break; |
| } |
| } |
| if (found_starget) |
| get_device(&found_starget->dev); |
| |
| return found_starget; |
| } |
| |
| /** |
| * scsi_target_reap_ref_release - remove target from visibility |
| * @kref: the reap_ref in the target being released |
| * |
| * Called on last put of reap_ref, which is the indication that no device |
| * under this target is visible anymore, so render the target invisible in |
| * sysfs. Note: we have to be in user context here because the target reaps |
| * should be done in places where the scsi device visibility is being removed. |
| */ |
| static void scsi_target_reap_ref_release(struct kref *kref) |
| { |
| struct scsi_target *starget |
| = container_of(kref, struct scsi_target, reap_ref); |
| |
| /* |
| * if we get here and the target is still in a CREATED state that |
| * means it was allocated but never made visible (because a scan |
| * turned up no LUNs), so don't call device_del() on it. |
| */ |
| if ((starget->state != STARGET_CREATED) && |
| (starget->state != STARGET_CREATED_REMOVE)) { |
| transport_remove_device(&starget->dev); |
| device_del(&starget->dev); |
| } |
| scsi_target_destroy(starget); |
| } |
| |
| static void scsi_target_reap_ref_put(struct scsi_target *starget) |
| { |
| kref_put(&starget->reap_ref, scsi_target_reap_ref_release); |
| } |
| |
| /** |
| * scsi_alloc_target - allocate a new or find an existing target |
| * @parent: parent of the target (need not be a scsi host) |
| * @channel: target channel number (zero if no channels) |
| * @id: target id number |
| * |
| * Return an existing target if one exists, provided it hasn't already |
| * gone into STARGET_DEL state, otherwise allocate a new target. |
| * |
| * The target is returned with an incremented reference, so the caller |
| * is responsible for both reaping and doing a last put |
| */ |
| static struct scsi_target *scsi_alloc_target(struct device *parent, |
| int channel, uint id) |
| { |
| struct Scsi_Host *shost = dev_to_shost(parent); |
| struct device *dev = NULL; |
| unsigned long flags; |
| const int size = sizeof(struct scsi_target) |
| + shost->transportt->target_size; |
| struct scsi_target *starget; |
| struct scsi_target *found_target; |
| int error, ref_got; |
| |
| starget = kzalloc(size, GFP_KERNEL); |
| if (!starget) { |
| printk(KERN_ERR "%s: allocation failure\n", __func__); |
| return NULL; |
| } |
| dev = &starget->dev; |
| device_initialize(dev); |
| kref_init(&starget->reap_ref); |
| dev->parent = get_device(parent); |
| dev_set_name(dev, "target%d:%d:%d", shost->host_no, channel, id); |
| dev->bus = &scsi_bus_type; |
| dev->type = &scsi_target_type; |
| starget->id = id; |
| starget->channel = channel; |
| starget->can_queue = 0; |
| INIT_LIST_HEAD(&starget->siblings); |
| INIT_LIST_HEAD(&starget->devices); |
| starget->state = STARGET_CREATED; |
| starget->scsi_level = SCSI_2; |
| starget->max_target_blocked = SCSI_DEFAULT_TARGET_BLOCKED; |
| retry: |
| spin_lock_irqsave(shost->host_lock, flags); |
| |
| found_target = __scsi_find_target(parent, channel, id); |
| if (found_target) |
| goto found; |
| |
| list_add_tail(&starget->siblings, &shost->__targets); |
| spin_unlock_irqrestore(shost->host_lock, flags); |
| /* allocate and add */ |
| transport_setup_device(dev); |
| if (shost->hostt->target_alloc) { |
| error = shost->hostt->target_alloc(starget); |
| |
| if(error) { |
| dev_printk(KERN_ERR, dev, "target allocation failed, error %d\n", error); |
| /* don't want scsi_target_reap to do the final |
| * put because it will be under the host lock */ |
| scsi_target_destroy(starget); |
| return NULL; |
| } |
| } |
| get_device(dev); |
| |
| return starget; |
| |
| found: |
| /* |
| * release routine already fired if kref is zero, so if we can still |
| * take the reference, the target must be alive. If we can't, it must |
| * be dying and we need to wait for a new target |
| */ |
| ref_got = kref_get_unless_zero(&found_target->reap_ref); |
| |
| spin_unlock_irqrestore(shost->host_lock, flags); |
| if (ref_got) { |
| put_device(dev); |
| return found_target; |
| } |
| /* |
| * Unfortunately, we found a dying target; need to wait until it's |
| * dead before we can get a new one. There is an anomaly here. We |
| * *should* call scsi_target_reap() to balance the kref_get() of the |
| * reap_ref above. However, since the target being released, it's |
| * already invisible and the reap_ref is irrelevant. If we call |
| * scsi_target_reap() we might spuriously do another device_del() on |
| * an already invisible target. |
| */ |
| put_device(&found_target->dev); |
| /* |
| * length of time is irrelevant here, we just want to yield the CPU |
| * for a tick to avoid busy waiting for the target to die. |
| */ |
| msleep(1); |
| goto retry; |
| } |
| |
| /** |
| * scsi_target_reap - check to see if target is in use and destroy if not |
| * @starget: target to be checked |
| * |
| * This is used after removing a LUN or doing a last put of the target |
| * it checks atomically that nothing is using the target and removes |
| * it if so. |
| */ |
| void scsi_target_reap(struct scsi_target *starget) |
| { |
| /* |
| * serious problem if this triggers: STARGET_DEL is only set in the if |
| * the reap_ref drops to zero, so we're trying to do another final put |
| * on an already released kref |
| */ |
| BUG_ON(starget->state == STARGET_DEL); |
| scsi_target_reap_ref_put(starget); |
| } |
| |
| /** |
| * scsi_sanitize_inquiry_string - remove non-graphical chars from an |
| * INQUIRY result string |
| * @s: INQUIRY result string to sanitize |
| * @len: length of the string |
| * |
| * Description: |
| * The SCSI spec says that INQUIRY vendor, product, and revision |
| * strings must consist entirely of graphic ASCII characters, |
| * padded on the right with spaces. Since not all devices obey |
| * this rule, we will replace non-graphic or non-ASCII characters |
| * with spaces. Exception: a NUL character is interpreted as a |
| * string terminator, so all the following characters are set to |
| * spaces. |
| **/ |
| void scsi_sanitize_inquiry_string(unsigned char *s, int len) |
| { |
| int terminated = 0; |
| |
| for (; len > 0; (--len, ++s)) { |
| if (*s == 0) |
| terminated = 1; |
| if (terminated || *s < 0x20 || *s > 0x7e) |
| *s = ' '; |
| } |
| } |
| EXPORT_SYMBOL(scsi_sanitize_inquiry_string); |
| |
| /** |
| * scsi_probe_lun - probe a single LUN using a SCSI INQUIRY |
| * @sdev: scsi_device to probe |
| * @inq_result: area to store the INQUIRY result |
| * @result_len: len of inq_result |
| * @bflags: store any bflags found here |
| * |
| * Description: |
| * Probe the lun associated with @req using a standard SCSI INQUIRY; |
| * |
| * If the INQUIRY is successful, zero is returned and the |
| * INQUIRY data is in @inq_result; the scsi_level and INQUIRY length |
| * are copied to the scsi_device any flags value is stored in *@bflags. |
| **/ |
| static int scsi_probe_lun(struct scsi_device *sdev, unsigned char *inq_result, |
| int result_len, blist_flags_t *bflags) |
| { |
| unsigned char scsi_cmd[MAX_COMMAND_SIZE]; |
| int first_inquiry_len, try_inquiry_len, next_inquiry_len; |
| int response_len = 0; |
| int pass, count, result; |
| struct scsi_sense_hdr sshdr; |
| |
| *bflags = 0; |
| |
| /* Perform up to 3 passes. The first pass uses a conservative |
| * transfer length of 36 unless sdev->inquiry_len specifies a |
| * different value. */ |
| first_inquiry_len = sdev->inquiry_len ? sdev->inquiry_len : 36; |
| try_inquiry_len = first_inquiry_len; |
| pass = 1; |
| |
| next_pass: |
| SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev, |
| "scsi scan: INQUIRY pass %d length %d\n", |
| pass, try_inquiry_len)); |
| |
| /* Each pass gets up to three chances to ignore Unit Attention */ |
| for (count = 0; count < 3; ++count) { |
| int resid; |
| |
| memset(scsi_cmd, 0, 6); |
| scsi_cmd[0] = INQUIRY; |
| scsi_cmd[4] = (unsigned char) try_inquiry_len; |
| |
| memset(inq_result, 0, try_inquiry_len); |
| |
| result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, |
| inq_result, try_inquiry_len, &sshdr, |
| HZ / 2 + HZ * scsi_inq_timeout, 3, |
| &resid); |
| |
| SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev, |
| "scsi scan: INQUIRY %s with code 0x%x\n", |
| result ? "failed" : "successful", result)); |
| |
| if (result) { |
| /* |
| * not-ready to ready transition [asc/ascq=0x28/0x0] |
| * or power-on, reset [asc/ascq=0x29/0x0], continue. |
| * INQUIRY should not yield UNIT_ATTENTION |
| * but many buggy devices do so anyway. |
| */ |
| if (driver_byte(result) == DRIVER_SENSE && |
| scsi_sense_valid(&sshdr)) { |
| if ((sshdr.sense_key == UNIT_ATTENTION) && |
| ((sshdr.asc == 0x28) || |
| (sshdr.asc == 0x29)) && |
| (sshdr.ascq == 0)) |
| continue; |
| } |
| } else { |
| /* |
| * if nothing was transferred, we try |
| * again. It's a workaround for some USB |
| * devices. |
| */ |
| if (resid == try_inquiry_len) |
| continue; |
| } |
| break; |
| } |
| |
| if (result == 0) { |
| scsi_sanitize_inquiry_string(&inq_result[8], 8); |
| scsi_sanitize_inquiry_string(&inq_result[16], 16); |
| scsi_sanitize_inquiry_string(&inq_result[32], 4); |
| |
| response_len = inq_result[4] + 5; |
| if (response_len > 255) |
| response_len = first_inquiry_len; /* sanity */ |
| |
| /* |
| * Get any flags for this device. |
| * |
| * XXX add a bflags to scsi_device, and replace the |
| * corresponding bit fields in scsi_device, so bflags |
| * need not be passed as an argument. |
| */ |
| *bflags = scsi_get_device_flags(sdev, &inq_result[8], |
| &inq_result[16]); |
| |
| /* When the first pass succeeds we gain information about |
| * what larger transfer lengths might work. */ |
| if (pass == 1) { |
| if (BLIST_INQUIRY_36 & *bflags) |
| next_inquiry_len = 36; |
| else if (sdev->inquiry_len) |
| next_inquiry_len = sdev->inquiry_len; |
| else |
| next_inquiry_len = response_len; |
| |
| /* If more data is available perform the second pass */ |
| if (next_inquiry_len > try_inquiry_len) { |
| try_inquiry_len = next_inquiry_len; |
| pass = 2; |
| goto next_pass; |
| } |
| } |
| |
| } else if (pass == 2) { |
| sdev_printk(KERN_INFO, sdev, |
| "scsi scan: %d byte inquiry failed. " |
| "Consider BLIST_INQUIRY_36 for this device\n", |
| try_inquiry_len); |
| |
| /* If this pass failed, the third pass goes back and transfers |
| * the same amount as we successfully got in the first pass. */ |
| try_inquiry_len = first_inquiry_len; |
| pass = 3; |
| goto next_pass; |
| } |
| |
| /* If the last transfer attempt got an error, assume the |
| * peripheral doesn't exist or is dead. */ |
| if (result) |
| return -EIO; |
| |
| /* Don't report any more data than the device says is valid */ |
| sdev->inquiry_len = min(try_inquiry_len, response_len); |
| |
| /* |
| * XXX Abort if the response length is less than 36? If less than |
| * 32, the lookup of the device flags (above) could be invalid, |
| * and it would be possible to take an incorrect action - we do |
| * not want to hang because of a short INQUIRY. On the flip side, |
| * if the device is spun down or becoming ready (and so it gives a |
| * short INQUIRY), an abort here prevents any further use of the |
| * device, including spin up. |
| * |
| * On the whole, the best approach seems to be to assume the first |
| * 36 bytes are valid no matter what the device says. That's |
| * better than copying < 36 bytes to the inquiry-result buffer |
| * and displaying garbage for the Vendor, Product, or Revision |
| * strings. |
| */ |
| if (sdev->inquiry_len < 36) { |
| if (!sdev->host->short_inquiry) { |
| shost_printk(KERN_INFO, sdev->host, |
| "scsi scan: INQUIRY result too short (%d)," |
| " using 36\n", sdev->inquiry_len); |
| sdev->host->short_inquiry = 1; |
| } |
| sdev->inquiry_len = 36; |
| } |
| |
| /* |
| * Related to the above issue: |
| * |
| * XXX Devices (disk or all?) should be sent a TEST UNIT READY, |
| * and if not ready, sent a START_STOP to start (maybe spin up) and |
| * then send the INQUIRY again, since the INQUIRY can change after |
| * a device is initialized. |
| * |
| * Ideally, start a device if explicitly asked to do so. This |
| * assumes that a device is spun up on power on, spun down on |
| * request, and then spun up on request. |
| */ |
| |
| /* |
| * The scanning code needs to know the scsi_level, even if no |
| * device is attached at LUN 0 (SCSI_SCAN_TARGET_PRESENT) so |
| * non-zero LUNs can be scanned. |
| */ |
| sdev->scsi_level = inq_result[2] & 0x07; |
| if (sdev->scsi_level >= 2 || |
| (sdev->scsi_level == 1 && (inq_result[3] & 0x0f) == 1)) |
| sdev->scsi_level++; |
| sdev->sdev_target->scsi_level = sdev->scsi_level; |
| |
| /* |
| * If SCSI-2 or lower, and if the transport requires it, |
| * store the LUN value in CDB[1]. |
| */ |
| sdev->lun_in_cdb = 0; |
| if (sdev->scsi_level <= SCSI_2 && |
| sdev->scsi_level != SCSI_UNKNOWN && |
| !sdev->host->no_scsi2_lun_in_cdb) |
| sdev->lun_in_cdb = 1; |
| |
| return 0; |
| } |
| |
| /** |
| * scsi_add_lun - allocate and fully initialze a scsi_device |
| * @sdev: holds information to be stored in the new scsi_device |
| * @inq_result: holds the result of a previous INQUIRY to the LUN |
| * @bflags: black/white list flag |
| * @async: 1 if this device is being scanned asynchronously |
| * |
| * Description: |
| * Initialize the scsi_device @sdev. Optionally set fields based |
| * on values in *@bflags. |
| * |
| * Return: |
| * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device |
| * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized |
| **/ |
| static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result, |
| blist_flags_t *bflags, int async) |
| { |
| int ret; |
| |
| /* |
| * XXX do not save the inquiry, since it can change underneath us, |
| * save just vendor/model/rev. |
| * |
| * Rather than save it and have an ioctl that retrieves the saved |
| * value, have an ioctl that executes the same INQUIRY code used |
| * in scsi_probe_lun, let user level programs doing INQUIRY |
| * scanning run at their own risk, or supply a user level program |
| * that can correctly scan. |
| */ |
| |
| /* |
| * Copy at least 36 bytes of INQUIRY data, so that we don't |
| * dereference unallocated memory when accessing the Vendor, |
| * Product, and Revision strings. Badly behaved devices may set |
| * the INQUIRY Additional Length byte to a small value, indicating |
| * these strings are invalid, but often they contain plausible data |
| * nonetheless. It doesn't matter if the device sent < 36 bytes |
| * total, since scsi_probe_lun() initializes inq_result with 0s. |
| */ |
| sdev->inquiry = kmemdup(inq_result, |
| max_t(size_t, sdev->inquiry_len, 36), |
| GFP_ATOMIC); |
| if (sdev->inquiry == NULL) |
| return SCSI_SCAN_NO_RESPONSE; |
| |
| sdev->vendor = (char *) (sdev->inquiry + 8); |
| sdev->model = (char *) (sdev->inquiry + 16); |
| sdev->rev = (char *) (sdev->inquiry + 32); |
| |
| if (strncmp(sdev->vendor, "ATA ", 8) == 0) { |
| /* |
| * sata emulation layer device. This is a hack to work around |
| * the SATL power management specifications which state that |
| * when the SATL detects the device has gone into standby |
| * mode, it shall respond with NOT READY. |
| */ |
| sdev->allow_restart = 1; |
| } |
| |
| if (*bflags & BLIST_ISROM) { |
| sdev->type = TYPE_ROM; |
| sdev->removable = 1; |
| } else { |
| sdev->type = (inq_result[0] & 0x1f); |
| sdev->removable = (inq_result[1] & 0x80) >> 7; |
| |
| /* |
| * some devices may respond with wrong type for |
| * well-known logical units. Force well-known type |
| * to enumerate them correctly. |
| */ |
| if (scsi_is_wlun(sdev->lun) && sdev->type != TYPE_WLUN) { |
| sdev_printk(KERN_WARNING, sdev, |
| "%s: correcting incorrect peripheral device type 0x%x for W-LUN 0x%16xhN\n", |
| __func__, sdev->type, (unsigned int)sdev->lun); |
| sdev->type = TYPE_WLUN; |
| } |
| |
| } |
| |
| if (sdev->type == TYPE_RBC || sdev->type == TYPE_ROM) { |
| /* RBC and MMC devices can return SCSI-3 compliance and yet |
| * still not support REPORT LUNS, so make them act as |
| * BLIST_NOREPORTLUN unless BLIST_REPORTLUN2 is |
| * specifically set */ |
| if ((*bflags & BLIST_REPORTLUN2) == 0) |
| *bflags |= BLIST_NOREPORTLUN; |
| } |
| |
| /* |
| * For a peripheral qualifier (PQ) value of 1 (001b), the SCSI |
| * spec says: The device server is capable of supporting the |
| * specified peripheral device type on this logical unit. However, |
| * the physical device is not currently connected to this logical |
| * unit. |
| * |
| * The above is vague, as it implies that we could treat 001 and |
| * 011 the same. Stay compatible with previous code, and create a |
| * scsi_device for a PQ of 1 |
| * |
| * Don't set the device offline here; rather let the upper |
| * level drivers eval the PQ to decide whether they should |
| * attach. So remove ((inq_result[0] >> 5) & 7) == 1 check. |
| */ |
| |
| sdev->inq_periph_qual = (inq_result[0] >> 5) & 7; |
| sdev->lockable = sdev->removable; |
| sdev->soft_reset = (inq_result[7] & 1) && ((inq_result[3] & 7) == 2); |
| |
| if (sdev->scsi_level >= SCSI_3 || |
| (sdev->inquiry_len > 56 && inq_result[56] & 0x04)) |
| sdev->ppr = 1; |
| if (inq_result[7] & 0x60) |
| sdev->wdtr = 1; |
| if (inq_result[7] & 0x10) |
| sdev->sdtr = 1; |
| |
| sdev_printk(KERN_NOTICE, sdev, "%s %.8s %.16s %.4s PQ: %d " |
| "ANSI: %d%s\n", scsi_device_type(sdev->type), |
| sdev->vendor, sdev->model, sdev->rev, |
| sdev->inq_periph_qual, inq_result[2] & 0x07, |
| (inq_result[3] & 0x0f) == 1 ? " CCS" : ""); |
| |
| if ((sdev->scsi_level >= SCSI_2) && (inq_result[7] & 2) && |
| !(*bflags & BLIST_NOTQ)) { |
| sdev->tagged_supported = 1; |
| sdev->simple_tags = 1; |
| } |
| |
| /* |
| * Some devices (Texel CD ROM drives) have handshaking problems |
| * when used with the Seagate controllers. borken is initialized |
| * to 1, and then set it to 0 here. |
| */ |
| if ((*bflags & BLIST_BORKEN) == 0) |
| sdev->borken = 0; |
| |
| if (*bflags & BLIST_NO_ULD_ATTACH) |
| sdev->no_uld_attach = 1; |
| |
| /* |
| * Apparently some really broken devices (contrary to the SCSI |
| * standards) need to be selected without asserting ATN |
| */ |
| if (*bflags & BLIST_SELECT_NO_ATN) |
| sdev->select_no_atn = 1; |
| |
| /* |
| * Maximum 512 sector transfer length |
| * broken RA4x00 Compaq Disk Array |
| */ |
| if (*bflags & BLIST_MAX_512) |
| blk_queue_max_hw_sectors(sdev->request_queue, 512); |
| /* |
| * Max 1024 sector transfer length for targets that report incorrect |
| * max/optimal lengths and relied on the old block layer safe default |
| */ |
| else if (*bflags & BLIST_MAX_1024) |
| blk_queue_max_hw_sectors(sdev->request_queue, 1024); |
| |
| /* |
| * Some devices may not want to have a start command automatically |
| * issued when a device is added. |
| */ |
| if (*bflags & BLIST_NOSTARTONADD) |
| sdev->no_start_on_add = 1; |
| |
| if (*bflags & BLIST_SINGLELUN) |
| scsi_target(sdev)->single_lun = 1; |
| |
| sdev->use_10_for_rw = 1; |
| |
| /* some devices don't like REPORT SUPPORTED OPERATION CODES |
| * and will simply timeout causing sd_mod init to take a very |
| * very long time */ |
| if (*bflags & BLIST_NO_RSOC) |
| sdev->no_report_opcodes = 1; |
| |
| /* set the device running here so that slave configure |
| * may do I/O */ |
| mutex_lock(&sdev->state_mutex); |
| ret = scsi_device_set_state(sdev, SDEV_RUNNING); |
| if (ret) |
| ret = scsi_device_set_state(sdev, SDEV_BLOCK); |
| mutex_unlock(&sdev->state_mutex); |
| |
| if (ret) { |
| sdev_printk(KERN_ERR, sdev, |
| "in wrong state %s to complete scan\n", |
| scsi_device_state_name(sdev->sdev_state)); |
| return SCSI_SCAN_NO_RESPONSE; |
| } |
| |
| if (*bflags & BLIST_NOT_LOCKABLE) |
| sdev->lockable = 0; |
| |
| if (*bflags & BLIST_RETRY_HWERROR) |
| sdev->retry_hwerror = 1; |
| |
| if (*bflags & BLIST_NO_DIF) |
| sdev->no_dif = 1; |
| |
| if (*bflags & BLIST_UNMAP_LIMIT_WS) |
| sdev->unmap_limit_for_ws = 1; |
| |
| sdev->eh_timeout = SCSI_DEFAULT_EH_TIMEOUT; |
| |
| if (*bflags & BLIST_TRY_VPD_PAGES) |
| sdev->try_vpd_pages = 1; |
| else if (*bflags & BLIST_SKIP_VPD_PAGES) |
| sdev->skip_vpd_pages = 1; |
| |
| transport_configure_device(&sdev->sdev_gendev); |
| |
| if (sdev->host->hostt->slave_configure) { |
| ret = sdev->host->hostt->slave_configure(sdev); |
| if (ret) { |
| /* |
| * if LLDD reports slave not present, don't clutter |
| * console with alloc failure messages |
| */ |
| if (ret != -ENXIO) { |
| sdev_printk(KERN_ERR, sdev, |
| "failed to configure device\n"); |
| } |
| return SCSI_SCAN_NO_RESPONSE; |
| } |
| } |
| |
| if (sdev->scsi_level >= SCSI_3) |
| scsi_attach_vpd(sdev); |
| |
| sdev->max_queue_depth = sdev->queue_depth; |
| sdev->sdev_bflags = *bflags; |
| |
| /* |
| * Ok, the device is now all set up, we can |
| * register it and tell the rest of the kernel |
| * about it. |
| */ |
| if (!async && scsi_sysfs_add_sdev(sdev) != 0) |
| return SCSI_SCAN_NO_RESPONSE; |
| |
| return SCSI_SCAN_LUN_PRESENT; |
| } |
| |
| #ifdef CONFIG_SCSI_LOGGING |
| /** |
| * scsi_inq_str - print INQUIRY data from min to max index, strip trailing whitespace |
| * @buf: Output buffer with at least end-first+1 bytes of space |
| * @inq: Inquiry buffer (input) |
| * @first: Offset of string into inq |
| * @end: Index after last character in inq |
| */ |
| static unsigned char *scsi_inq_str(unsigned char *buf, unsigned char *inq, |
| unsigned first, unsigned end) |
| { |
| unsigned term = 0, idx; |
| |
| for (idx = 0; idx + first < end && idx + first < inq[4] + 5; idx++) { |
| if (inq[idx+first] > ' ') { |
| buf[idx] = inq[idx+first]; |
| term = idx+1; |
| } else { |
| buf[idx] = ' '; |
| } |
| } |
| buf[term] = 0; |
| return buf; |
| } |
| #endif |
| |
| /** |
| * scsi_probe_and_add_lun - probe a LUN, if a LUN is found add it |
| * @starget: pointer to target device structure |
| * @lun: LUN of target device |
| * @bflagsp: store bflags here if not NULL |
| * @sdevp: probe the LUN corresponding to this scsi_device |
| * @rescan: if not equal to SCSI_SCAN_INITIAL skip some code only |
| * needed on first scan |
| * @hostdata: passed to scsi_alloc_sdev() |
| * |
| * Description: |
| * Call scsi_probe_lun, if a LUN with an attached device is found, |
| * allocate and set it up by calling scsi_add_lun. |
| * |
| * Return: |
| * |
| * - SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device |
| * - SCSI_SCAN_TARGET_PRESENT: target responded, but no device is |
| * attached at the LUN |
| * - SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized |
| **/ |
| static int scsi_probe_and_add_lun(struct scsi_target *starget, |
| u64 lun, blist_flags_t *bflagsp, |
| struct scsi_device **sdevp, |
| enum scsi_scan_mode rescan, |
| void *hostdata) |
| { |
| struct scsi_device *sdev; |
| unsigned char *result; |
| blist_flags_t bflags; |
| int res = SCSI_SCAN_NO_RESPONSE, result_len = 256; |
| struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); |
| |
| /* |
| * The rescan flag is used as an optimization, the first scan of a |
| * host adapter calls into here with rescan == 0. |
| */ |
| sdev = scsi_device_lookup_by_target(starget, lun); |
| if (sdev) { |
| if (rescan != SCSI_SCAN_INITIAL || !scsi_device_created(sdev)) { |
| SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev, |
| "scsi scan: device exists on %s\n", |
| dev_name(&sdev->sdev_gendev))); |
| if (sdevp) |
| *sdevp = sdev; |
| else |
| scsi_device_put(sdev); |
| |
| if (bflagsp) |
| *bflagsp = scsi_get_device_flags(sdev, |
| sdev->vendor, |
| sdev->model); |
| return SCSI_SCAN_LUN_PRESENT; |
| } |
| scsi_device_put(sdev); |
| } else |
| sdev = scsi_alloc_sdev(starget, lun, hostdata); |
| if (!sdev) |
| goto out; |
| |
| result = kmalloc(result_len, GFP_ATOMIC | |
| ((shost->unchecked_isa_dma) ? __GFP_DMA : 0)); |
| if (!result) |
| goto out_free_sdev; |
| |
| if (scsi_probe_lun(sdev, result, result_len, &bflags)) |
| goto out_free_result; |
| |
| if (bflagsp) |
| *bflagsp = bflags; |
| /* |
| * result contains valid SCSI INQUIRY data. |
| */ |
| if ((result[0] >> 5) == 3) { |
| /* |
| * For a Peripheral qualifier 3 (011b), the SCSI |
| * spec says: The device server is not capable of |
| * supporting a physical device on this logical |
| * unit. |
| * |
| * For disks, this implies that there is no |
| * logical disk configured at sdev->lun, but there |
| * is a target id responding. |
| */ |
| SCSI_LOG_SCAN_BUS(2, sdev_printk(KERN_INFO, sdev, "scsi scan:" |
| " peripheral qualifier of 3, device not" |
| " added\n")) |
| if (lun == 0) { |
| SCSI_LOG_SCAN_BUS(1, { |
| unsigned char vend[9]; |
| unsigned char mod[17]; |
| |
| sdev_printk(KERN_INFO, sdev, |
| "scsi scan: consider passing scsi_mod." |
| "dev_flags=%s:%s:0x240 or 0x1000240\n", |
| scsi_inq_str(vend, result, 8, 16), |
| scsi_inq_str(mod, result, 16, 32)); |
| }); |
| |
| } |
| |
| res = SCSI_SCAN_TARGET_PRESENT; |
| goto out_free_result; |
| } |
| |
| /* |
| * Some targets may set slight variations of PQ and PDT to signal |
| * that no LUN is present, so don't add sdev in these cases. |
| * Two specific examples are: |
| * 1) NetApp targets: return PQ=1, PDT=0x1f |
| * 2) USB UFI: returns PDT=0x1f, with the PQ bits being "reserved" |
| * in the UFI 1.0 spec (we cannot rely on reserved bits). |
| * |
| * References: |
| * 1) SCSI SPC-3, pp. 145-146 |
| * PQ=1: "A peripheral device having the specified peripheral |
| * device type is not connected to this logical unit. However, the |
| * device server is capable of supporting the specified peripheral |
| * device type on this logical unit." |
| * PDT=0x1f: "Unknown or no device type" |
| * 2) USB UFI 1.0, p. 20 |
| * PDT=00h Direct-access device (floppy) |
| * PDT=1Fh none (no FDD connected to the requested logical unit) |
| */ |
| if (((result[0] >> 5) == 1 || starget->pdt_1f_for_no_lun) && |
| (result[0] & 0x1f) == 0x1f && |
| !scsi_is_wlun(lun)) { |
| SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev, |
| "scsi scan: peripheral device type" |
| " of 31, no device added\n")); |
| res = SCSI_SCAN_TARGET_PRESENT; |
| goto out_free_result; |
| } |
| |
| res = scsi_add_lun(sdev, result, &bflags, shost->async_scan); |
| if (res == SCSI_SCAN_LUN_PRESENT) { |
| if (bflags & BLIST_KEY) { |
| sdev->lockable = 0; |
| scsi_unlock_floptical(sdev, result); |
| } |
| } |
| |
| out_free_result: |
| kfree(result); |
| out_free_sdev: |
| if (res == SCSI_SCAN_LUN_PRESENT) { |
| if (sdevp) { |
| if (scsi_device_get(sdev) == 0) { |
| *sdevp = sdev; |
| } else { |
| __scsi_remove_device(sdev); |
| res = SCSI_SCAN_NO_RESPONSE; |
| } |
| } |
| } else |
| __scsi_remove_device(sdev); |
| out: |
| return res; |
| } |
| |
| /** |
| * scsi_sequential_lun_scan - sequentially scan a SCSI target |
| * @starget: pointer to target structure to scan |
| * @bflags: black/white list flag for LUN 0 |
| * @scsi_level: Which version of the standard does this device adhere to |
| * @rescan: passed to scsi_probe_add_lun() |
| * |
| * Description: |
| * Generally, scan from LUN 1 (LUN 0 is assumed to already have been |
| * scanned) to some maximum lun until a LUN is found with no device |
| * attached. Use the bflags to figure out any oddities. |
| * |
| * Modifies sdevscan->lun. |
| **/ |
| static void scsi_sequential_lun_scan(struct scsi_target *starget, |
| blist_flags_t bflags, int scsi_level, |
| enum scsi_scan_mode rescan) |
| { |
| uint max_dev_lun; |
| u64 sparse_lun, lun; |
| struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); |
| |
| SCSI_LOG_SCAN_BUS(3, starget_printk(KERN_INFO, starget, |
| "scsi scan: Sequential scan\n")); |
| |
| max_dev_lun = min(max_scsi_luns, shost->max_lun); |
| /* |
| * If this device is known to support sparse multiple units, |
| * override the other settings, and scan all of them. Normally, |
| * SCSI-3 devices should be scanned via the REPORT LUNS. |
| */ |
| if (bflags & BLIST_SPARSELUN) { |
| max_dev_lun = shost->max_lun; |
| sparse_lun = 1; |
| } else |
| sparse_lun = 0; |
| |
| /* |
| * If less than SCSI_1_CCS, and no special lun scanning, stop |
| * scanning; this matches 2.4 behaviour, but could just be a bug |
| * (to continue scanning a SCSI_1_CCS device). |
| * |
| * This test is broken. We might not have any device on lun0 for |
| * a sparselun device, and if that's the case then how would we |
| * know the real scsi_level, eh? It might make sense to just not |
| * scan any SCSI_1 device for non-0 luns, but that check would best |
| * go into scsi_alloc_sdev() and just have it return null when asked |
| * to alloc an sdev for lun > 0 on an already found SCSI_1 device. |
| * |
| if ((sdevscan->scsi_level < SCSI_1_CCS) && |
| ((bflags & (BLIST_FORCELUN | BLIST_SPARSELUN | BLIST_MAX5LUN)) |
| == 0)) |
| return; |
| */ |
| /* |
| * If this device is known to support multiple units, override |
| * the other settings, and scan all of them. |
| */ |
| if (bflags & BLIST_FORCELUN) |
| max_dev_lun = shost->max_lun; |
| /* |
| * REGAL CDC-4X: avoid hang after LUN 4 |
| */ |
| if (bflags & BLIST_MAX5LUN) |
| max_dev_lun = min(5U, max_dev_lun); |
| /* |
| * Do not scan SCSI-2 or lower device past LUN 7, unless |
| * BLIST_LARGELUN. |
| */ |
| if (scsi_level < SCSI_3 && !(bflags & BLIST_LARGELUN)) |
| max_dev_lun = min(8U, max_dev_lun); |
| else |
| max_dev_lun = min(256U, max_dev_lun); |
| |
| /* |
| * We have already scanned LUN 0, so start at LUN 1. Keep scanning |
| * until we reach the max, or no LUN is found and we are not |
| * sparse_lun. |
| */ |
| for (lun = 1; lun < max_dev_lun; ++lun) |
| if ((scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, |
| NULL) != SCSI_SCAN_LUN_PRESENT) && |
| !sparse_lun) |
| return; |
| } |
| |
| /** |
| * scsi_report_lun_scan - Scan using SCSI REPORT LUN results |
| * @starget: which target |
| * @bflags: Zero or a mix of BLIST_NOLUN, BLIST_REPORTLUN2, or BLIST_NOREPORTLUN |
| * @rescan: nonzero if we can skip code only needed on first scan |
| * |
| * Description: |
| * Fast scanning for modern (SCSI-3) devices by sending a REPORT LUN command. |
| * Scan the resulting list of LUNs by calling scsi_probe_and_add_lun. |
| * |
| * If BLINK_REPORTLUN2 is set, scan a target that supports more than 8 |
| * LUNs even if it's older than SCSI-3. |
| * If BLIST_NOREPORTLUN is set, return 1 always. |
| * If BLIST_NOLUN is set, return 0 always. |
| * If starget->no_report_luns is set, return 1 always. |
| * |
| * Return: |
| * 0: scan completed (or no memory, so further scanning is futile) |
| * 1: could not scan with REPORT LUN |
| **/ |
| static int scsi_report_lun_scan(struct scsi_target *starget, blist_flags_t bflags, |
| enum scsi_scan_mode rescan) |
| { |
| unsigned char scsi_cmd[MAX_COMMAND_SIZE]; |
| unsigned int length; |
| u64 lun; |
| unsigned int num_luns; |
| unsigned int retries; |
| int result; |
| struct scsi_lun *lunp, *lun_data; |
| struct scsi_sense_hdr sshdr; |
| struct scsi_device *sdev; |
| struct Scsi_Host *shost = dev_to_shost(&starget->dev); |
| int ret = 0; |
| |
| /* |
| * Only support SCSI-3 and up devices if BLIST_NOREPORTLUN is not set. |
| * Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does |
| * support more than 8 LUNs. |
| * Don't attempt if the target doesn't support REPORT LUNS. |
| */ |
| if (bflags & BLIST_NOREPORTLUN) |
| return 1; |
| if (starget->scsi_level < SCSI_2 && |
| starget->scsi_level != SCSI_UNKNOWN) |
| return 1; |
| if (starget->scsi_level < SCSI_3 && |
| (!(bflags & BLIST_REPORTLUN2) || shost->max_lun <= 8)) |
| return 1; |
| if (bflags & BLIST_NOLUN) |
| return 0; |
| if (starget->no_report_luns) |
| return 1; |
| |
| if (!(sdev = scsi_device_lookup_by_target(starget, 0))) { |
| sdev = scsi_alloc_sdev(starget, 0, NULL); |
| if (!sdev) |
| return 0; |
| if (scsi_device_get(sdev)) { |
| __scsi_remove_device(sdev); |
| return 0; |
| } |
| } |
| |
| /* |
| * Allocate enough to hold the header (the same size as one scsi_lun) |
| * plus the number of luns we are requesting. 511 was the default |
| * value of the now removed max_report_luns parameter. |
| */ |
| length = (511 + 1) * sizeof(struct scsi_lun); |
| retry: |
| lun_data = kmalloc(length, GFP_KERNEL | |
| (sdev->host->unchecked_isa_dma ? __GFP_DMA : 0)); |
| if (!lun_data) { |
| printk(ALLOC_FAILURE_MSG, __func__); |
| goto out; |
| } |
| |
| scsi_cmd[0] = REPORT_LUNS; |
| |
| /* |
| * bytes 1 - 5: reserved, set to zero. |
| */ |
| memset(&scsi_cmd[1], 0, 5); |
| |
| /* |
| * bytes 6 - 9: length of the command. |
| */ |
| put_unaligned_be32(length, &scsi_cmd[6]); |
| |
| scsi_cmd[10] = 0; /* reserved */ |
| scsi_cmd[11] = 0; /* control */ |
| |
| /* |
| * We can get a UNIT ATTENTION, for example a power on/reset, so |
| * retry a few times (like sd.c does for TEST UNIT READY). |
| * Experience shows some combinations of adapter/devices get at |
| * least two power on/resets. |
| * |
| * Illegal requests (for devices that do not support REPORT LUNS) |
| * should come through as a check condition, and will not generate |
| * a retry. |
| */ |
| for (retries = 0; retries < 3; retries++) { |
| SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev, |
| "scsi scan: Sending REPORT LUNS to (try %d)\n", |
| retries)); |
| |
| result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, |
| lun_data, length, &sshdr, |
| SCSI_REPORT_LUNS_TIMEOUT, 3, NULL); |
| |
| SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev, |
| "scsi scan: REPORT LUNS" |
| " %s (try %d) result 0x%x\n", |
| result ? "failed" : "successful", |
| retries, result)); |
| if (result == 0) |
| break; |
| else if (scsi_sense_valid(&sshdr)) { |
| if (sshdr.sense_key != UNIT_ATTENTION) |
| break; |
| } |
| } |
| |
| if (result) { |
| /* |
| * The device probably does not support a REPORT LUN command |
| */ |
| ret = 1; |
| goto out_err; |
| } |
| |
| /* |
| * Get the length from the first four bytes of lun_data. |
| */ |
| if (get_unaligned_be32(lun_data->scsi_lun) + |
| sizeof(struct scsi_lun) > length) { |
| length = get_unaligned_be32(lun_data->scsi_lun) + |
| sizeof(struct scsi_lun); |
| kfree(lun_data); |
| goto retry; |
| } |
| length = get_unaligned_be32(lun_data->scsi_lun); |
| |
| num_luns = (length / sizeof(struct scsi_lun)); |
| |
| SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev, |
| "scsi scan: REPORT LUN scan\n")); |
| |
| /* |
| * Scan the luns in lun_data. The entry at offset 0 is really |
| * the header, so start at 1 and go up to and including num_luns. |
| */ |
| for (lunp = &lun_data[1]; lunp <= &lun_data[num_luns]; lunp++) { |
| lun = scsilun_to_int(lunp); |
| |
| if (lun > sdev->host->max_lun) { |
| sdev_printk(KERN_WARNING, sdev, |
| "lun%llu has a LUN larger than" |
| " allowed by the host adapter\n", lun); |
| } else { |
| int res; |
| |
| res = scsi_probe_and_add_lun(starget, |
| lun, NULL, NULL, rescan, NULL); |
| if (res == SCSI_SCAN_NO_RESPONSE) { |
| /* |
| * Got some results, but now none, abort. |
| */ |
| sdev_printk(KERN_ERR, sdev, |
| "Unexpected response" |
| " from lun %llu while scanning, scan" |
| " aborted\n", (unsigned long long)lun); |
| break; |
| } |
| } |
| } |
| |
| out_err: |
| kfree(lun_data); |
| out: |
| if (scsi_device_created(sdev)) |
| /* |
| * the sdev we used didn't appear in the report luns scan |
| */ |
| __scsi_remove_device(sdev); |
| scsi_device_put(sdev); |
| return ret; |
| } |
| |
| struct scsi_device *__scsi_add_device(struct Scsi_Host *shost, uint channel, |
| uint id, u64 lun, void *hostdata) |
| { |
| struct scsi_device *sdev = ERR_PTR(-ENODEV); |
| struct device *parent = &shost->shost_gendev; |
| struct scsi_target *starget; |
| |
| if (strncmp(scsi_scan_type, "none", 4) == 0) |
| return ERR_PTR(-ENODEV); |
| |
| starget = scsi_alloc_target(parent, channel, id); |
| if (!starget) |
| return ERR_PTR(-ENOMEM); |
| scsi_autopm_get_target(starget); |
| |
| mutex_lock(&shost->scan_mutex); |
| if (!shost->async_scan) |
| scsi_complete_async_scans(); |
| |
| if (scsi_host_scan_allowed(shost) && scsi_autopm_get_host(shost) == 0) { |
| scsi_probe_and_add_lun(starget, lun, NULL, &sdev, 1, hostdata); |
| scsi_autopm_put_host(shost); |
| } |
| mutex_unlock(&shost->scan_mutex); |
| scsi_autopm_put_target(starget); |
| /* |
| * paired with scsi_alloc_target(). Target will be destroyed unless |
| * scsi_probe_and_add_lun made an underlying device visible |
| */ |
| scsi_target_reap(starget); |
| put_device(&starget->dev); |
| |
| return sdev; |
| } |
| EXPORT_SYMBOL(__scsi_add_device); |
| |
| int scsi_add_device(struct Scsi_Host *host, uint channel, |
| uint target, u64 lun) |
| { |
| struct scsi_device *sdev = |
| __scsi_add_device(host, channel, target, lun, NULL); |
| if (IS_ERR(sdev)) |
| return PTR_ERR(sdev); |
| |
| scsi_device_put(sdev); |
| return 0; |
| } |
| EXPORT_SYMBOL(scsi_add_device); |
| |
| void scsi_rescan_device(struct device *dev) |
| { |
| struct scsi_device *sdev = to_scsi_device(dev); |
| |
| device_lock(dev); |
| |
| scsi_attach_vpd(sdev); |
| |
| if (sdev->handler && sdev->handler->rescan) |
| sdev->handler->rescan(sdev); |
| |
| if (dev->driver && try_module_get(dev->driver->owner)) { |
| struct scsi_driver *drv = to_scsi_driver(dev->driver); |
| |
| if (drv->rescan) |
| drv->rescan(dev); |
| module_put(dev->driver->owner); |
| } |
| device_unlock(dev); |
| } |
| EXPORT_SYMBOL(scsi_rescan_device); |
| |
| static void __scsi_scan_target(struct device *parent, unsigned int channel, |
| unsigned int id, u64 lun, enum scsi_scan_mode rescan) |
| { |
| struct Scsi_Host *shost = dev_to_shost(parent); |
| blist_flags_t bflags = 0; |
| int res; |
| struct scsi_target *starget; |
| |
| if (shost->this_id == id) |
| /* |
| * Don't scan the host adapter |
| */ |
| return; |
| |
| starget = scsi_alloc_target(parent, channel, id); |
| if (!starget) |
| return; |
| scsi_autopm_get_target(starget); |
| |
| if (lun != SCAN_WILD_CARD) { |
| /* |
| * Scan for a specific host/chan/id/lun. |
| */ |
| scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, NULL); |
| goto out_reap; |
| } |
| |
| /* |
| * Scan LUN 0, if there is some response, scan further. Ideally, we |
| * would not configure LUN 0 until all LUNs are scanned. |
| */ |
| res = scsi_probe_and_add_lun(starget, 0, &bflags, NULL, rescan, NULL); |
| if (res == SCSI_SCAN_LUN_PRESENT || res == SCSI_SCAN_TARGET_PRESENT) { |
| if (scsi_report_lun_scan(starget, bflags, rescan) != 0) |
| /* |
| * The REPORT LUN did not scan the target, |
| * do a sequential scan. |
| */ |
| scsi_sequential_lun_scan(starget, bflags, |
| starget->scsi_level, rescan); |
| } |
| |
| out_reap: |
| scsi_autopm_put_target(starget); |
| /* |
| * paired with scsi_alloc_target(): determine if the target has |
| * any children at all and if not, nuke it |
| */ |
| scsi_target_reap(starget); |
| |
| put_device(&starget->dev); |
| } |
| |
| /** |
| * scsi_scan_target - scan a target id, possibly including all LUNs on the target. |
| * @parent: host to scan |
| * @channel: channel to scan |
| * @id: target id to scan |
| * @lun: Specific LUN to scan or SCAN_WILD_CARD |
| * @rescan: passed to LUN scanning routines; SCSI_SCAN_INITIAL for |
| * no rescan, SCSI_SCAN_RESCAN to rescan existing LUNs, |
| * and SCSI_SCAN_MANUAL to force scanning even if |
| * 'scan=manual' is set. |
| * |
| * Description: |
| * Scan the target id on @parent, @channel, and @id. Scan at least LUN 0, |
| * and possibly all LUNs on the target id. |
| * |
| * First try a REPORT LUN scan, if that does not scan the target, do a |
| * sequential scan of LUNs on the target id. |
| **/ |
| void scsi_scan_target(struct device *parent, unsigned int channel, |
| unsigned int id, u64 lun, enum scsi_scan_mode rescan) |
| { |
| struct Scsi_Host *shost = dev_to_shost(parent); |
| |
| if (strncmp(scsi_scan_type, "none", 4) == 0) |
| return; |
| |
| if (rescan != SCSI_SCAN_MANUAL && |
| strncmp(scsi_scan_type, "manual", 6) == 0) |
| return; |
| |
| mutex_lock(&shost->scan_mutex); |
| if (!shost->async_scan) |
| scsi_complete_async_scans(); |
| |
| if (scsi_host_scan_allowed(shost) && scsi_autopm_get_host(shost) == 0) { |
| __scsi_scan_target(parent, channel, id, lun, rescan); |
| scsi_autopm_put_host(shost); |
| } |
| mutex_unlock(&shost->scan_mutex); |
| } |
| EXPORT_SYMBOL(scsi_scan_target); |
| |
| static void scsi_scan_channel(struct Scsi_Host *shost, unsigned int channel, |
| unsigned int id, u64 lun, |
| enum scsi_scan_mode rescan) |
| { |
| uint order_id; |
| |
| if (id == SCAN_WILD_CARD) |
| for (id = 0; id < shost->max_id; ++id) { |
| /* |
| * XXX adapter drivers when possible (FCP, iSCSI) |
| * could modify max_id to match the current max, |
| * not the absolute max. |
| * |
| * XXX add a shost id iterator, so for example, |
| * the FC ID can be the same as a target id |
| * without a huge overhead of sparse id's. |
| */ |
| if (shost->reverse_ordering) |
| /* |
| * Scan from high to low id. |
| */ |
| order_id = shost->max_id - id - 1; |
| else |
| order_id = id; |
| __scsi_scan_target(&shost->shost_gendev, channel, |
| order_id, lun, rescan); |
| } |
| else |
| __scsi_scan_target(&shost->shost_gendev, channel, |
| id, lun, rescan); |
| } |
| |
| int scsi_scan_host_selected(struct Scsi_Host *shost, unsigned int channel, |
| unsigned int id, u64 lun, |
| enum scsi_scan_mode rescan) |
| { |
| SCSI_LOG_SCAN_BUS(3, shost_printk (KERN_INFO, shost, |
| "%s: <%u:%u:%llu>\n", |
| __func__, channel, id, lun)); |
| |
| if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) || |
| ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) || |
| ((lun != SCAN_WILD_CARD) && (lun >= shost->max_lun))) |
| return -EINVAL; |
| |
| mutex_lock(&shost->scan_mutex); |
| if (!shost->async_scan) |
| scsi_complete_async_scans(); |
| |
| if (scsi_host_scan_allowed(shost) && scsi_autopm_get_host(shost) == 0) { |
| if (channel == SCAN_WILD_CARD) |
| for (channel = 0; channel <= shost->max_channel; |
| channel++) |
| scsi_scan_channel(shost, channel, id, lun, |
| rescan); |
| else |
| scsi_scan_channel(shost, channel, id, lun, rescan); |
| scsi_autopm_put_host(shost); |
| } |
| mutex_unlock(&shost->scan_mutex); |
| |
| return 0; |
| } |
| |
| static void scsi_sysfs_add_devices(struct Scsi_Host *shost) |
| { |
| struct scsi_device *sdev; |
| shost_for_each_device(sdev, shost) { |
| /* target removed before the device could be added */ |
| if (sdev->sdev_state == SDEV_DEL) |
| continue; |
| /* If device is already visible, skip adding it to sysfs */ |
| if (sdev->is_visible) |
| continue; |
| if (!scsi_host_scan_allowed(shost) || |
| scsi_sysfs_add_sdev(sdev) != 0) |
| __scsi_remove_device(sdev); |
| } |
| } |
| |
| /** |
| * scsi_prep_async_scan - prepare for an async scan |
| * @shost: the host which will be scanned |
| * Returns: a cookie to be passed to scsi_finish_async_scan() |
| * |
| * Tells the midlayer this host is going to do an asynchronous scan. |
| * It reserves the host's position in the scanning list and ensures |
| * that other asynchronous scans started after this one won't affect the |
| * ordering of the discovered devices. |
| */ |
| static struct async_scan_data *scsi_prep_async_scan(struct Scsi_Host *shost) |
| { |
| struct async_scan_data *data; |
| unsigned long flags; |
| |
| if (strncmp(scsi_scan_type, "sync", 4) == 0) |
| return NULL; |
| |
| if (shost->async_scan) { |
| shost_printk(KERN_DEBUG, shost, "%s called twice\n", __func__); |
| return NULL; |
| } |
| |
| data = kmalloc(sizeof(*data), GFP_KERNEL); |
| if (!data) |
| goto err; |
| data->shost = scsi_host_get(shost); |
| if (!data->shost) |
| goto err; |
| init_completion(&data->prev_finished); |
| |
| mutex_lock(&shost->scan_mutex); |
| spin_lock_irqsave(shost->host_lock, flags); |
| shost->async_scan = 1; |
| spin_unlock_irqrestore(shost->host_lock, flags); |
| mutex_unlock(&shost->scan_mutex); |
| |
| spin_lock(&async_scan_lock); |
| if (list_empty(&scanning_hosts)) |
| complete(&data->prev_finished); |
| list_add_tail(&data->list, &scanning_hosts); |
| spin_unlock(&async_scan_lock); |
| |
| return data; |
| |
| err: |
| kfree(data); |
| return NULL; |
| } |
| |
| /** |
| * scsi_finish_async_scan - asynchronous scan has finished |
| * @data: cookie returned from earlier call to scsi_prep_async_scan() |
| * |
| * All the devices currently attached to this host have been found. |
| * This function announces all the devices it has found to the rest |
| * of the system. |
| */ |
| static void scsi_finish_async_scan(struct async_scan_data *data) |
| { |
| struct Scsi_Host *shost; |
| unsigned long flags; |
| |
| if (!data) |
| return; |
| |
| shost = data->shost; |
| |
| mutex_lock(&shost->scan_mutex); |
| |
| if (!shost->async_scan) { |
| shost_printk(KERN_INFO, shost, "%s called twice\n", __func__); |
| dump_stack(); |
| mutex_unlock(&shost->scan_mutex); |
| return; |
| } |
| |
| wait_for_completion(&data->prev_finished); |
| |
| scsi_sysfs_add_devices(shost); |
| |
| spin_lock_irqsave(shost->host_lock, flags); |
| shost->async_scan = 0; |
| spin_unlock_irqrestore(shost->host_lock, flags); |
| |
| mutex_unlock(&shost->scan_mutex); |
| |
| spin_lock(&async_scan_lock); |
| list_del(&data->list); |
| if (!list_empty(&scanning_hosts)) { |
| struct async_scan_data *next = list_entry(scanning_hosts.next, |
| struct async_scan_data, list); |
| complete(&next->prev_finished); |
| } |
| spin_unlock(&async_scan_lock); |
| |
| scsi_autopm_put_host(shost); |
| scsi_host_put(shost); |
| kfree(data); |
| } |
| |
| static void do_scsi_scan_host(struct Scsi_Host *shost) |
| { |
| if (shost->hostt->scan_finished) { |
| unsigned long start = jiffies; |
| if (shost->hostt->scan_start) |
| shost->hostt->scan_start(shost); |
| |
| while (!shost->hostt->scan_finished(shost, jiffies - start)) |
| msleep(10); |
| } else { |
| scsi_scan_host_selected(shost, SCAN_WILD_CARD, SCAN_WILD_CARD, |
| SCAN_WILD_CARD, 0); |
| } |
| } |
| |
| static void do_scan_async(void *_data, async_cookie_t c) |
| { |
| struct async_scan_data *data = _data; |
| struct Scsi_Host *shost = data->shost; |
| |
| do_scsi_scan_host(shost); |
| scsi_finish_async_scan(data); |
| } |
| |
| /** |
| * scsi_scan_host - scan the given adapter |
| * @shost: adapter to scan |
| **/ |
| void scsi_scan_host(struct Scsi_Host *shost) |
| { |
| struct async_scan_data *data; |
| |
| if (strncmp(scsi_scan_type, "none", 4) == 0 || |
| strncmp(scsi_scan_type, "manual", 6) == 0) |
| return; |
| if (scsi_autopm_get_host(shost) < 0) |
| return; |
| |
| data = scsi_prep_async_scan(shost); |
| if (!data) { |
| do_scsi_scan_host(shost); |
| scsi_autopm_put_host(shost); |
| return; |
| } |
| |
| /* register with the async subsystem so wait_for_device_probe() |
| * will flush this work |
| */ |
| async_schedule(do_scan_async, data); |
| |
| /* scsi_autopm_put_host(shost) is called in scsi_finish_async_scan() */ |
| } |
| EXPORT_SYMBOL(scsi_scan_host); |
| |
| void scsi_forget_host(struct Scsi_Host *shost) |
| { |
| struct scsi_device *sdev; |
| unsigned long flags; |
| |
| restart: |
| spin_lock_irqsave(shost->host_lock, flags); |
| list_for_each_entry(sdev, &shost->__devices, siblings) { |
| if (sdev->sdev_state == SDEV_DEL) |
| continue; |
| spin_unlock_irqrestore(shost->host_lock, flags); |
| __scsi_remove_device(sdev); |
| goto restart; |
| } |
| spin_unlock_irqrestore(shost->host_lock, flags); |
| } |
| |
| /** |
| * scsi_get_host_dev - Create a scsi_device that points to the host adapter itself |
| * @shost: Host that needs a scsi_device |
| * |
| * Lock status: None assumed. |
| * |
| * Returns: The scsi_device or NULL |
| * |
| * Notes: |
| * Attach a single scsi_device to the Scsi_Host - this should |
| * be made to look like a "pseudo-device" that points to the |
| * HA itself. |
| * |
| * Note - this device is not accessible from any high-level |
| * drivers (including generics), which is probably not |
| * optimal. We can add hooks later to attach. |
| */ |
| struct scsi_device *scsi_get_host_dev(struct Scsi_Host *shost) |
| { |
| struct scsi_device *sdev = NULL; |
| struct scsi_target *starget; |
| |
| mutex_lock(&shost->scan_mutex); |
| if (!scsi_host_scan_allowed(shost)) |
| goto out; |
| starget = scsi_alloc_target(&shost->shost_gendev, 0, shost->this_id); |
| if (!starget) |
| goto out; |
| |
| sdev = scsi_alloc_sdev(starget, 0, NULL); |
| if (sdev) |
| sdev->borken = 0; |
| else |
| scsi_target_reap(starget); |
| put_device(&starget->dev); |
| out: |
| mutex_unlock(&shost->scan_mutex); |
| return sdev; |
| } |
| EXPORT_SYMBOL(scsi_get_host_dev); |
| |
| /** |
| * scsi_free_host_dev - Free a scsi_device that points to the host adapter itself |
| * @sdev: Host device to be freed |
| * |
| * Lock status: None assumed. |
| * |
| * Returns: Nothing |
| */ |
| void scsi_free_host_dev(struct scsi_device *sdev) |
| { |
| BUG_ON(sdev->id != sdev->host->this_id); |
| |
| __scsi_remove_device(sdev); |
| } |
| EXPORT_SYMBOL(scsi_free_host_dev); |
| |